GF42.45-P-3700D ESP control mode, function

GF42.45-P-3700D ESP control mode, function
- with CODE (472) Electronic Stability Program (ESP)

Component Identification:

In the process the front axle pump VA (p1) draws brake fluid out of the reservoir via the inlet solenoid valve (y22) and via the master brake cylinder and prepares high pressure for introduction into the corresponding wheel brake.

If extremely rapid stabilizing action is required, the pressure build-up phase is boosted by active actuation of the Brake Assist system. This directs atmospheric pressure against the rear of the diaphragms in the brake booster, producing a pressure of approx. 5 bar in the brake circuits.

The pilot pressure thus produced is lead via the check valve (7) from the front axle switchover solenoid valve (y1) 8) into the active brake circuit to the right front brake caliper until the pressure downstream of the check valve (7) is higher than the primary pressure.

At the same time the pilot pressure is applied via the front axle inlet solenoid valve VA (y22) to the intake side of the front axle pump (p1) and improves its fill level and delivery rate. The pilot pressure is kept away from the inactive wheel brakes by closing the solenoid valves (y6, y10, y12).

The pressure limiting valve integrated in the rear axle switchover solenoid valve (y19) serves high pressure limitation. The valve opens at pressure valves > 150 bar.

Component Identification:

The brake fluid flowing back returns via the front axle pump (p1) through the pressure limiting valve integrated in the front axle switchover solenoid valve (y1) 8) via the master brake cylinder to the brake fluid reservoir.

The rear axle pump (p2) is actuated pulsed during all control phases (depending on the requirement).

Various damping components (12, 13, 14) are installed to further reduce noise levels.